1930 was a free year.
January 31 - The London Naval Conference opens, ending on April 22 with an agreement between the United Kingdom, the United States, France, Italy and Japan to regulate submarine warfare.
February 18 - Clyde Tombo discovers Pluto while studying photographs taken in January.
April 22 - France, Italy, Japan, the United States and the United Kingdom sign the London Maritime Agreement, which regulates submarine warfare and restricts the construction of warships.
June 7 - US President Herbert Hoover signs the Smooth-Howley Tariff Act.
July 12 - The first World Cup begins in Montevideo.
July 30 - Uruguay in Montevideo, with the victory in the final of the World Cup, over Argentina 4: 2, became the First World Champion in football.
January 11 - Rod Taylor, Australian-American actor (prem. 2015)
January 19 - Tipi Hedren, American actress, animal rights activist and model
January 20 - Baz Aldrin, American astronaut, engineer and military pilot, second man to set foot on the moon
January 30 - Gene Hackman, American actor and writer
February 8 - Petar Banićević, Serbian actor (prem. 2006)
February 10 - Robert Wagner, American actor
February 14 - Relja Bašić, Croatian actor (prem. 2017)
February 16 - Ljiljana Jovanovic, Serbian actress (prem. 2012)
February 27 - Petar Bergamo, Yugoslav composer
March 1 - Sava Antic, Serbian football player and football coach (prem. 1998)
March 1 - Gastone Nencini, Italian cyclist (prem. 1980)
March 1 - Majda Potokar, Slovenian actress (prem. 2001)
March 7 - Stanley Miller, American chemist, known for research into the origin of life (prem. 2007)
March 17 - James Irwin, American astronaut, aeronautical engineer and military pilot, eighth man to set foot on the moon (prem. 1991)
March 22 - Stephen Sondheim, American composer and songwriter (prem. 2021)
March 24 - Steve McQueen, American actor (prem. 1980)
March 27 - Ernest Ackun, Yugoslav and Serbian clarinetist (prem. 2001)
March 30 - John Astin, American actor
April 21 - Silvana Mangano, Italian actor